Swinging door mechanism



June 20, 1933- E. l.. SHAFFER SWING'ING DOOR MECHANISM Original FiledSept. 9, 1929 4 Sheets-Sheet l INVENTOR.

ATToRNEY June 20, 1933. E. L sHAFFER SWINGING DOOR MECHANISM OriginalFiled Sept. 9, 1929 4 Sheets-Sheet 2 fili ji. .fo Q

' INVENTOR. I .JLJKLWL June 20, 1933. E. SHAFFER 1,915,205

SWINGING DOOR MECHANISM Original Filed Sept. 9, 1929 4 Sheets-Sheet 3INVENTOR.

June 20, 1933. E. L. sHAFl-ER 1,915,205

SWINGING DOOR MECHANISM Original Filed Sept. 9, 1929 4 Sheets-Sheet 412910. g fvwm .L x j* RWS /.3. A

Patented June 20, 1933 PATENT OFFICE ERNEST L. SHAFFER, OF VINTON, IOWASWINGING DOOR MECHANISM Application led September 9, 1929, Serial No.391,445.

This invention is a novel swinging door unit particularly adapted foruse in garages and the like, having a door assembly comprising threedoor sections hinged together at their adjacent edges and movable as aunit trom open to closed positions, and vice versa; and the principalobject of my invention is to provide swinging door units adapted to beplaced either overhead or at the side walls of the garage for carryingthe door assembly, which units will be easy to operate, stable, strong,weather-proof, and which will not bind.

Further objects are to provide units as above described which will becompletely housed within the garage or other enclosure in any and allpositions of the doors; to provide units which will require very littlespace for operation; to provide units designed so that any twisting ofthe frame ot the garage or other building will not affect the operationthereof; and to provide an overhead unit which will not permit the doorsto drag upon the floor while swinging.

r" Still further objects of the invention are to provide electric meansfor opening and closing the door assembly and for operating both theoverhead or sidewall units.

Other minor objects of the invention will be hereinafter set forth.

I will explain the invention with reference to the accompanying drawingswhich illustrate practical embodiments thereof to enable others to adoptand use the same; and

l will summarize in the claims the novel features ot' construction, andnovel combinations of parts, for which protection is desired.

In said drawings- Fig. 1 is plan view looking upwardly upon the baseplate and compoundl lever carrying the door assembly in the overheadunit, the doors being shown in closed position.

Fi r. 2 is a. view similar to Fig. 1 but showl ing t e parts as theyappear in partly closed i position.

Fig. 8 is a rear elevation of the door assembly in the overhead unit.

Fig. 4 is an enlarged rear elevation of the brackets adj ustablysupporting the door assembly in the overhead unit.

Renewed June 12, 1931.

Fig. 5 is a side elevation of the compound lever and bracket connectionswhich adjustably support the door in the overhead unit.

Fig. 6 is a top plan View of the means permitting independent opening ofone oi' the doors in the overhead unit.

Fig. 7 is an enlarged detail of the latch means for controlling thevertical adjustment of the door assembly.

Fig. 8 is a side elevation ot the side-wall unit, showing the doorassembly in closeil position.

Fig. 9 is a similar View showing assembly in partly closed position. Y'

Fig. 10 is a plan view of the electrical operating means for theoverhead unit.

Fig. 11 is a section on the line 11-11, Fig. 10.

Fig. 12 is an end view of the trolley carriage shown in Fig. 11.

Fig. 13 is a rear elevation of the door assembly locking means for thesidewall unit.

Fig. 14.- is a section on line Mtv-14, Fig. 13.

Fig. 15 is a detail.

Fig. 16 is a transverse section through the electric carriage. Y

Fig. 17 is a longitudinal section therethrough.

As shown in Figs. l-7, inclusive, the overhead unit comprises a baseplate Vl adapted to be secured to the ceiling rafters R of a garage orthe like opposite the door opening S thereof, which plate 1 carries acompound lever 2, secured to brackets vertically adjustably supportingthe middle door B ot the door assembly. the door B carrying at its sidesthe door sections A and C hinged to the section B.

Base plate l, while supporting the com pound lever 2. 3, for saidbracket, also coutrols the opening and closing movements ot the outerdoor sections A and C, and for this purpose the edge et plate 1 adjacentopening S has a compound curvature consisting ot an arcuate portion 1cconcentric with the pivot bolt 2a, of lever 2, the arcuate portion lcembracing the full width of door B when in open position and the fullwidth of the door B when in closed position to permit Operation of thecarriage 2c of middle door B through an arc of more than 90 degrees.Plate l is supported sufliciently below the rafters R to permit thecarriage wheels 2d of section B to engage the arcuate edge of plate land also to allow the rollers A and C of end doors and C ample room tofunction against the arcuate edge as the doors are shifted from open toclosed positions.

At each end of arcuate portion le of plate l is a reverse curved portionld adapted to align doors and C with door B when in either 'liront orside positions, the rollers A and C on doors and C engaging the edge ofplate l and being directed against the reversed curved portions ldthereof by means of guide plates le suitably spaced from plate l toembrace the rollers A', and C therebetween.

The compound lever for the door supporting bracket comprises a pair ofspaced roe 2 connected together at their rear ends by means of clip 27),the rods 2 carrying intermediate their ends the pivot bearing and boltila, which are preferably adjustable longitudinally of rods to vary theradius of swing of the doors. The front ends of rods 2 are connected toa carriage 2c for the middle door B. which carriage 2c is provided withsets of opposed rollers 2d adapted to engage the upper and lower facesof plate l in way of the arcuate edge lc as the carriage 2c is swung byrods 2 around from open to closed position. t the front ends of rods 2below carriage 2c is a depending bracket rigidly secured to the saidrods by a socket plate 2li and lying adjacent the rear face of door B,said bracket consisting of upper and lower members Qc, 2f connectedtogether by vertical bars 2o and cross braces 2h, whereby the bracketwill be carried by the carriage Qc and will rotate therewith in a fixedhorizontal plane.

Pivoted as a 3ft to the center bearing 2a for vertical movement is aframe comprising a pair of ba 3, which frame swings laterally with rods2 the latter are swung. The forward ends of the bars 3 carry a member 3esecured to the back of door B and vertically slidably mounted upon thebars 2g of the bracket carried by the carriage 2c.

The forward ends of levers 3 are connected b v links 3c to a plate Solsecured to the member Se which member is securely fastened to the backof door B and slidably mounted on the two vertical rods 2r] whereby thedoor assembly A, B, C can be moved up and down while permitting thestructure to be rigid and stable as required. A. second member 3f ispreferably secured to door B below member Se and also slidably mount-edupon the vertical bars 2g. The rear ends of levers 3 carry a counterbalancing weight 3l), which weight balances the combined weight of thedoor sections A, B, C so that the doors A, B, C may be readily raisedand lowered with respect to the carriage 2c. The door assembly B, C isthus eapable of being raised and lowered with refusent to the garagefloor in order to overcome the undesirable feature of drag which iscommon to most garage doors.

The door assembly is preferably locked in raised or lowered position asshown in Figs. 3 and 7. A bar 'la is connected to the lower end of thefixed liracket member' and extends down through the keeper of a Yalelock l and down through a guide et?) disposed below the lock, the bar4.1L being notched as shown and adapted to receive the bolt of lockflwhen thel door assembly is in lowered position. A manual lock bolt 4cis also provided, shown in Fig. 7, operated in a handle 4&7. mounted onthe outside of door B whereby the handle. 4.1i is rocked the bolt lle,which normally engages one of the notches in bar 4f: is withdrawn fromengagement therewith against the action of spring 4c so that. the doorassembly may be raised or loweredy provided the bolt of lock 4 is notengaged with bar f-ln. lVhen knob 4d is released the spring 4e willreturn bolt le into engagement with a notch in the bar 4a and willmaintain the door assembly in adjust-ed elevation. Bolt 4c is hinged ina slot in the rocking knob lf] so that rocking handle 4d to a verticalposition withdraws springbolt 4e and lets the door assembly B, C free tofloat coiinterbalanced by weight Piz?.

lill-ien the door assembly is in closed7 and locked position, the doorsare held against any inward thrust at their bottoms by floor )locks A2,B2, C2 (Fig. $3) at the center and sides of the door jambs and itnecessary to raise the door assembly above the tops oft-he fixed vdoorblocks AQ, B2, C2, before the door assembly can be opened or closed7 andthis raising of the coiinterbalanced door assembly also prevents drag ofthe doors during swinging. lf one of 'the side doors such as A, is usedas a single entrance door, its floor block A2 would preferably be hingedor re.. moved.

ln connection with the side .floors and C. I provide radius arms 5, eacharm 5 being pivoted on a` toggle block 5a sl idably mounted between therods 2 in rear of pivot bearing 2a, and the outer ends of the arms 5 areconnected with the brackets of rollers A and C. whereby as the doorassembly is swung from front to side position the arms .i willsimultaneously cause the inward or outward motion of one door A or C tobe imparted by the toggle action of sliding block 5a to the other door Cor A. Referring to Fig. l it will be seen that the outer end of thereverse curved portion ld of the base plate l engages the roller C ondoor C while the roller of door A is entirely disengaged from the edgeof plate l. Now as the assembly is swung from front to side position asshown in Fig. 2

" 6b the arm 5 is connected.

the roller C will necessarily follow its guide slot around the reversecurve portion 1d into the arcuate portion 1c, and the radius arm of doorC will shift block 5a rearwardly causing the door A (through the mediumof its arm 5) to swing through the same angle with respect to door B asthe door C, so that while the door assembly is being swung to sideposition when the roller C reaches the beginning of the arcuate portion1c, the roller A of door A will have contacted with the opposite end ofthe arcuate portion 1c and will have entered its related guide slot, anddoor C during the remainder of the A swinging movement of the assemblyto side position will be controlled by the movement of roller A of doorA. Hence when fully swung around to open7 position all three doors, A,B, C will again be aligned along the side wall of the garage.

Means are provided whereby one of the doors, such as A, may be openedindependently of the doors B and C for use as a singlev entrance, saidmeans comprising a bar 6a adapted to normally overlie the top of door A(Fig. 6), the inner end of bar 6a being pi totally secured, as at 6b tothe top of door B. The outer end of bar 6a carries a plate 6?) uponwhich the guide roller A of door A is journaled, and the radius arm 5 ofdoor A is also pivoted as at 6c to plate (3?). To the under side ofplate 6I) is secured one end of an arcuate bar 6d adapted to slidablyengage the top of door A to support the plate (3b and 5 the outer end ofbar 6a. The bars 6a and 6d together support at their outer ends innormal elevation the plate 6b regardless of the position of door A, andplate 6b carries the guide roller A for door A and to which plate Anotch 6e is formed in plate 6b adapted to receive a latch Gf (Fig. 3)operated by a knob 6g placed at usual height on door A, said knob 6gbeing connected by a link 6h to bell crank 6k the i vertical arm ofwhich extends upwardly and forms the latch (if which engages notch (Se.Hence the position of roller A will remain the same at all times asthough the roller A were actually carried by door A instead of by plate6b; and door A H1215 b@ freely Opened and closed without affecting theposition of roller A; and door A may be locked in normal position bylatch Gf engaging notch 6e.

In order that the door may be weatherl prooi, the upper door rail on theouter face of door B must necessarily be made arcuate so as to be ableto swing from front to side positions past the door frame S, so that noportion of the door B when starting to turn will project beyond itsfront position. If the assembly swung under the head opening for thedoor this would not be necessary. Door C may also be provided with anarcuate door rail in order to save in swing at its side position. Myinvention may be used for overhead or sidewall units; also both unitsmay be pre-formed, adapted to be readily installed.

The sidewall unit shown in Figs. 8 and 9 is similar to the overheadunit, above described. One sidewall unit 10 is placed adjacent thesidewalls on each side of a single opening; or if a double opening, theinside base units 10 are placed behind the center supporting column.Base unit 10 is composed of the same parts as base plate 1 describedwith reference to Figs. 1 and 2. On each base-unit 10 at a common centeris a bearing 11, which carries the lever arm 12.

Lever arm 12 is rigidly secured at its forward end to assembly bracket14, and the middle door section member B is also secured to assemblybracket 14, door sections A and C being hinged to middle section B.

The other end of lever 12 carries a counterbalance pivot bar 15 hingedthereto and which carries a weight 16. The members of lever 12 arespaced apart to form a guide for a toggle slide block 17. The radiusarms 17 a are pivotally connected to the slide block 17 and to theshafts of the guide rollers A and C of the respective door sections Aand C. The assembly bracket 14 is fitted with rollers 19 which rollagainst the bases 10 during the opening and closing movement, andmaintain thtl whole assembly rigid and square with respect to the dooropenings. On each assembly bracket 14 at 14a is fulcrumed a lever 18,and to one end ot lever 18 is attached a link 19 which is connected tothe counterbalance pivot bar 15. The other ends of link 18 are connectedby a rod 18a which is maintained in slidable engagement with the lowerpart of door C during the opening and closing movements by guide straps20 under which the rod 18a slides.

The side wall unit is approximately counterbalanced at bearings 11. theover-weight being slightly on the door side. At the bcginning of thelift upward. the bottom of door C and the top of door A areautomatically drawn inwardly by guide rollers C on lower door C movingin their guide slots in base units 10, and by the toggle action ofradius arms 17a. At the same time the movement of door C operates levers18 and links 19 connected with the connterbalance pivot bars 15, and thecounterbalance weight 16 is automatically swung inwardly toward bearing11, thus maintaining a substantially perfect counterbalance throughoutthe opening and closing movement. lf the counterbalance weights 16 weresecured directly on levers 12 the counterbalancing eliect would bepractically spent at two-thirds of the opening movement, but by use ofthe pivot bars 15 the counterbalance force is exerted through lever 19to give the necessary liit to door C to bring the whole assembly to thefull open position. In closing the operation is the reverse to that ofthe opening movement.

The locking device (Fig. 13) for the sidewall unit is placed at thecenter of the door section B. It comprises a horizontal rod 22 extendingacross door B and journaled in bearings 22a and extending to jambs S. Ateach end fitted a pawl 226. On each jamb S is secured a catch block 23.On rod 22 at its center is a quadrant worm gear 220 and on a shaft exending through door B is a worm 25 meshing with the quadrant gear Fixedon the same shaft 24 is a lock disc 26. On the end of shaft 24 extendingthrough door section B is a loop handle 24a. For inside operation ahandle 24?) is provided. ln position to engage a notch 26a in lockingdisc 26 is a Yale lock 27, with key barrel to outside and knob operationon inside. To operate from the outside lof the door, insert a key inlock 27 and lift bolt of Yale lock from notch 2Go of locking disc 26,turn loop handle 24a to revolve rod 22 and turn pawls 22a back fromengagement with catch blocks 23. A sharp pull upward on loop handle 24awill cause the door assembly to open.

Figs. 8 and l) also disclose the electric means tor operating thesidewall unit, i. e. for automatically opening and closing the doors, A,l, C. The electric means is adapted to be bracketed in place above thecenter of the door assembly and preferably comprises a pair ot' siderails 28 (Figs. 16 and 17) carrying chain sprockets 31 and 32 journaledadjacent the ends of the rails, and one sprocket may be mounted inadjustable bearings. Around the sprockets 31, 32 runs a chain 30; and lprovide plates 29 engaging the inner laces of the runs of chain 30respectively to prevent sagging thereof. One of the links of the chain30 carries a lug 30a adapted to enjgc either pawls 36 or 37 of acarriage 34, Mounted to roll upon side rails 28, the rails :f3 formingthe track on which carriage 34 is moved when chain member 30a engagesthe pawls 36 or 37 Carriage 34 is attached by a link 44 to the 'rop ofthe door A. Sprocket 31 :nay be the driving sprocket rotated by al motorcontrolled by a master switch. Small rollers (Fig, 1'7) are provided atthe contact points4 of pawls 3o and 37 to engage the face of the lug30a. in order that the release of pawls 3G or 37 from lug 30a duringtripping may be smooth and easy. Above the path of travel of carriage 34is a bar 50 upon which is mounted a three way switch 43 having itsengaged with a slide bar 40 mounted in bearings parallel with the sideframes 28. la r 40 is provided with stops 41 and 42 mounted adjacent theends thereof adapted to engage trips 38 carried by tbe carriage 34.lVhen carr 34 has drawn the doors A, B, l into open position and is atthe end of its specific-d travel trip 38 engages the stop 42 onreversirg rod 40. The spring tension of trip 3S is sutlicient to slidethe rod 40 to shift the contacts of switch 43. Adjustment of stop 42 onreversing rod 40 will give the desired length of travel for carriage 34.Pawl 36 will then roll over the driving lug 30a of chain 3() and thecarriage 34 will come to rest. Similarly the pawl 37 when engaged withlug 30a on the lower run of chain 30 will drive carriage 34 in theopposite direction, to close the doors A, B, C and when at the end ofits closing movement trip 38 will engage stop 41 and stop the motor andthe carriage will Colne to rest. In operation, upon throwing the switchfor opening movement the motor will setI chain 30 in motion and lug 30awill engage pawl 36 and move the carriage 34 which is connected by link44 to top of door A, and thus draw the countcrbalanced door assemblyopen. As carriage 34 nears end of its opening travel trip 33 on thecarriage engage4 stop 42 of bar 4() and shifts the contacts of switch43. To close the doors, turn switch 'l'l to closing Contact and the carriage is drawn to closed end of travel by lug 30.1( engaging pawl 37,the stop 41 shifting the contacts at the end of the carriage travel andstopping the motor. The belt 3() rims in the same direction lfor bothmovements, but the direction of motion of carriage 34 is governed by theengagement of lug 30a with pawls 3G or 37.

l also provide an electrical unit for operating the overhead system, thesame being illustrated in Figs. 10, 11, 12. This unit comprises anarcuate track 111 concentric with the pivot 2a of the swinging leverframe 3 and placed adjacent the counterbalance weight 3b. Track 111 ispreferably made up of upper and lower bars (Fig. 11) spaced apartbetween which the grooved wheels 111m of a carriage 116 run, thecarriage beine' suitably bracketed to the end of lever 3 by a rod 11Go.Carriage 11G preferably crnnpriscs an A-franic having the wheels 11Godisposed at the top and bottom of one leg of the frame. The other leg1166 is connected by a link 119 to an arm 12() extending laterally fromthe carriage 34 similar to that as above explained with reference toFigs. 8, 9, 16 and 17, which carriage moves at right angles to thenormal closed position of lever 3. The inner end of track 111 is bentsharply upwardly as at 1110i so that when the carriage wheels 11Go rideup the portion 1110y the door assembly at the opposite end ef lever 3will receive a sudden downward thrust to automatically lower the doorassembly A, B, C behind their floor blocks lll, C2 just after the doorshave been swxng' around into closed position.

In operation, as the carriage 34 of the electric is moved'over the trackthe push or pull is applied through armswllt) and 12() to the carria ge116 which traverses the circular track 111 swinging the lever 3 to openor closed position, The movement of carriage 34 is controlled asspecified in connection with ies Figs. 8 and 9. The lower'wheel 116e(Fig. 11). acts as a fulcrum for lever 11612 to pull the upper wheeldown the vertical portion Illa of track 111 into the horizontal portion.The pull down of the rear wheel through rod 1160 lifts the door assemblyat the opposite end of the lever 3 and when both wheels lla have enteredthe horizontal portion of track 111 the door assembly will bemaintained. in raised position while being swung to open7 position.

I do not limit my invention to the exact form shown in the drawings forobviously changes may be made therein within the scope of the claims.

I claim:

l. In combina-tion a swinging door having middle and side door sectionshinged together, a base plate adopted to be secured adjacent the dooropening, the edge of the base plate adjacent the opening being arcuatewith reverse curved slotted portions at the ends of the arcuate portion,a lever pivoted on said base plate concentric with the arcuate edgeportion; a bracket movably engaging the arcuate edge portion and mountedon said lever; said bracket carrying the middle door section; means forcounterbalancing the weight of the doors; guide rollers carried by theside door sections adapted to enter the reverse curve slots; and togglemeans for causing the hinging movement of one side door to be impartedto the other.

2. In a swinging door unit as set forth in claim l; the base plate beingmounted above the door opening; said lever being compound with onemember thereof carrying the toggle and bracket, and the other memberAthereof carrying the door sections and eounterbalance; whereby the saidcounterbalanced door sections will be vertically adj ustably mountedwith respect to the bracket; and means for maintaining the door sectionsat adjusted elevation.

3. In combination, a swinging door having a plurality of connectedrelatively movable sections; a swingable carrier for said door connectedto one section and adapted to move the door from its fully closedposition into its fully opened position; a member slidably mounted onthe carrier; and means operated by the member for aligning the severalsections edgewise as they move into fully closed or into fully openedpositions.

4. In combination, a swinging door having a plurality of connectedrelatively movable sections; a swingable carrier for said door connectedto one section and adapted to move the door from its fully closedposition into its fully opened position; guides adjacent the extremelimits of movement of the door; and means operated by said guidesaligning the sections edgewise as the door nears its fully closed orfully opened position.

5. In combination, a swinging door having a plurality of connectedrelatively movable sections; a swingable carrier for said door connectedto an inner section and adapted to move the door from its fully closedposition into its fully opened position; means for causing the hingingmovement of one end door section to swing the other end section; guidesadjacent the extreme limits of movement of the door; and devices on theend door sections engaging said guides for causing the end door hingingmeans to align the sections edgewi-se as the door approaches fullyclosed or fully opened positions.

6. In a combi-nation as set forth in claim 5, means for permitting oneend door to be opened irrespective of said end door hinging means.

7 In a combination as set forth in claim 5,

one guide engaging device being carried by a frame pivotally mountedupon the inner door section, said frame being connected to the end doorhinging means; and latch means for locking the related end door to theframe whereby when the latch is sprung said end door may be openedwithout operating the hinging means.

8. In a combination as set forth in claim 5; means for counterbalancingthe weight of the door sections.

9. In a combi-nation as set forth in claim 5, said carrier moving in ahorizontal plane; and said door sections being vertically adj ustablewith respect to the carrier; a counterbalancing lever connecting theinner door with .the carrier; and a weight carried by the lever.

10. In a combina-tionv as set forth in claim 5; said carrier moving in avertical plane; a counterbalancing lever on the carrier; a. Weightpivotally mounted on said lever; and meansoperatedby the hingingmovement of the endy door sections for swinging the weight inwardly asthe end door sections are hinged inwardly. i

1l. In a combination as-set forth in claim 5, power means for swingingthe carrier in either direction; and means for automatically stoppingthe carrier at the ends of its speci-fied travel.

12...l In acombination asset forth in claim 5, a track,-a carriageadapted to traverse theV track and connected to swing the doors; powermeans for driving the carriage in either direction; and means on thecarriage for automatically stopping same atthe end of its-specifiedtravel. ,l z j 1??. .In combination, a swinging door having a pluralityof hinged sections; a swingable carrier connected; to one section andadapted to move said door from its fully closed position into its fullyopened position; and means for aligning the several sections edgewise asthey' move into fully closed or into. fully opened positions and forHexing the hinged sections to substantially conform with the arc ofswing of the carrier While moving from one position to the other.

14. In combination as set forth in claim 13, said means comprising meansfor causing the hinging movement of one end door to swing the other enddoor; means for causing one end door to initially Hex the hingedseclions at the beginning of the opening or closing movement, and meansfor causing the other end door to re-align the sections at the end ofthe said movement.

15. In combination; a swinging door having a plurality of hingedsections; a pivoted carrier connected to an inner door section forcarrying said door from its fully closed to its fully opened position;means connecting the end door sections for causing said sections tohinge together; and means for aligning the several sections when infully closed and in fully opened positions and for flexing the sectionsto substantially conform with the arc of swing of the carrier Whilemoving from one position to the other.

16. In a combination as set forth in claim 15, said aligning meanscomprising curved guides adjacent the eXtreme limits of movement of thedoor; and members on the end door sections adapted to engage the guideswhereby one section Will initially 'leX the sections at the beginning ofthe opening or closing movement and the other end section Will re-alignthe sections at the end of the said movement.

17. In combination, a swinging door having a plurality of hingedsections; a curved track; a carriage movable on said track and connectedto an inner door section for carrying said section from fully closed tofully opened positions; means connecting the end door sections forcausing said end sections to hinge together; means for aligning all thesections When the door is in fully closed and in fully opened positionsand for flexing the sections to substantially conform With the curvatureof the track While the door is moving from one position to the other.

18. In a combination as set forth in claim 17 said aligning meanscomprising curved guides opposite the ends of the track, and members onthe end doors adapted to engage the guides whereby the trailing sectionWill initially flex the sections Vat the beginning of the opening orClosing movement of the door, and the leading section will re-align thesections at the end of the said movement.

19. In combination a swinging door having middle and end door sectionshinged together; an arcuate track adjacent the opening having reversecurved guides at each end thereof; a lever pivoted concentric with thearcuate track; a carriage movable on the arcuate track and mounted onsaid lever, said carriage carrying the middle door section; devicescarried by the end door sections adapted to enter the reverse curvedguides for

